Would you be willing to change your page.tpl.php file to dynamically pull the file names out of the slideshows folder? It would just be adding something similar to the code below in place of the hardcoded img's.

<div class="slideshow">
<?PHP
$count=0;
if ($handle = opendir('./sites/all/themes/danland/images/slideshows')) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") { ?>
<img src="<?php print $base_path . $directory ."/images/slideshows/". $file; ?>" width="950" height="355" alt="slideshow <?=$count?>"/>
        <? $count++; }
    }
    closedir($handle);
}
?>
</div>

What do you think?